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PDF STR4A164HD Data sheet ( Hoja de datos )
| Número de pieza | STR4A164HD | |
| Descripción | Off-Line PWM Controllers | |
| Fabricantes | Sanken | |
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Off-Line PWM Controllers with Integrated Power MOSFET
STR4A100 Series
Data Sheet
Description
The STR4A100 series are power ICs for switching
power supplies, incorporating a sense MOSFET and a
current mode PWM controller IC.
The low standby power is accomplished by the
automatic switching between the PWM operation in
normal operation and the burst-oscillation under light
load conditions. The product achieves high
cost-performance power supply systems with few
external components.
Features
● Current Mode Type PWM Control
● Auto Standby Function
No Load Power Consumption < 10 mW
● Operation Mode
Normal Operation: PWM Mode
Standby : Burst Oscillation Mode
● Random Switching Function
● Slope Compensation Function
● Leading Edge Blanking Function
● Bias Assist Function
● Soft Start Function
● Protections
− Overcurrent Protection (OCP) : Pulse-by-Pulse,
built-in compensation circuit to minimize OCP point
variation on AC input voltage
− Overload Protection (OLP) : Aauto-restart
− Overvoltage Protection (OVP) : Auto-restart
− Thermal Shutdown (TSD) : Auto-restart with
hysteresis
Typical Application
VAC
BR1
C1
U1
STR4A100
S/GND
5
S/GND
6
S/GND
7
S/GND
8
D/ST
4
VCC
2
FB/OLP
1
C3
D51
T1
C5 R1
P
D1
C51
S
D2 R2
L2
R54
PC1 R51
R55
R52
C52 R53
U51
R56
C2
PC1
D
C6
VOUT
(+)
C53
(-)
Package
DIP8
SOIC8
Not to Scale
Lineup
● Electrical Characteristics
VD/ST(max.) = 730 V
Products
Package fOSC(AVG)
STR4A162S
SOIC8
STR4A162D
STR4A164D
DIP8
65kHz
STR4A164HD DIP8 100kHz
RDS(ON)
(max.)
24.6 Ω
12.9 Ω
12.9 Ω
IDLIM(H)
0.365 A
0.520 A
0.485 A
● Output Power, POUT*
Products
STR4A162S
Adapter
AC85
AC230V ~265V
5W 4W
Open frame
AC85
AC230V ~265V
7 W 5.5 W
STR4A162D
5.5 W 4.5 W 7.5 W 6 W
STR4A164D
8 W 6 W 10 W 8.5 W
STR4A164HD
9W
7 W 13 W 10.5 W
* The output power is actual continues power that is measured at
50 °C ambient. The peak output power can be 120 to 140 % of the
value stated here. Core size, ON Duty, and thermal design affect the
output power. It may be less than the value stated here.
Application
● White goods
● Auxiliary power for Flat TVs
● Low power AC/DC adapter
● Battery Chargers
● Other SMPS
TC_STR4A100_1_R1
STR4A100 - DSJ Rev.3.3
SANKEN ELECTRIC CO.,LTD.
Aug.06, 2015
http://www.sanken-ele.co.jp
© SANKEN ELECTRIC CO.,LTD. 2011
1
1 page  
STR4A100 Series
Parameter
Symbol Conditions
OLP Delay Time
tOLP VFB = OPEN
FB/OLP Pin Clamp Voltage VFB(CLAMP)
OVP Threshold Voltage
Thermal Shutdown Operating
Temperature(2)
Thermal Shutdown
Hysteresis(2)
MOSFET
Drain Leakage Current
On Resistance
VCC(OVP)
Tj(TSD)
Tj(TSDHYS)
IDSS
RDS(ON)
Ta = 125 °C
VFB = 0 V
VD/ST = 584 V
ID = 37 mA
ID = 52 mA
Switching Time
tf
Thermal Characteristics
Thermal Resistance(2)
θj-F (3)
θj-C (4)
Pins Min. Typ. Max. Units
− 58 76 94 ms
1−8 10.5 12.0 13.5 V
2−8 27.5 29.5 31.5 V
− 135 −
− °C
− − 70 − °C
Notes
4−8 −
− 50 µA
− 21.0 24.6
4A162××
4−8 Ω
− 11.0 12.9
4A164××
4−8 −
− 250 ns
− − 18
4A162D
− − − 21 °C/W 4A162S
− − 16
4A164D
/ 64HD
− − 15
4A162D
− − − 16 °C/W 4A162S
− − 15
4A164D
/ 64HD
(3) θj-F is thermal resistance between junction of MIC and frame. Frame temperature (TF) is measured at the root of the 7
pin (S/GND).
(4) θj-C is thermal resistance between junction of MIC and case. Case temperature (TC) is measured at the center of the
case top surface
STR4A100 - DSJ Rev.3.3
SANKEN ELECTRIC CO.,LTD.
Aug.06, 2015
http://www.sanken-ele.co.jp
© SANKEN ELECTRIC CO.,LTD. 2011
5
5 Page 
STR4A100 Series
process based on actual operation in the application, so
that poor starting conditions may be avoided.
Figure 10-3 shows the VCC pin voltage behavior
during the startup period.
After the VCC pin voltage increases to VCC(ON) = 15.2
V at startup, the IC starts the operation. Then circuit
current increases and the VCC pin voltage decreases. At
the same time, the auxiliary winding voltage, VD,
increases in proportion to output voltage. These are all
balanced to produce the VCC pin voltage.
When the VCC pin voltage is decrease to
VCC(OFF) = 8.1 V in startup operation, the IC stops
switching operation and a startup failure occurs.
When the output load is light at startup, the output
voltage may become more than the target voltage due to
the delay of feedback circuit. In this case, the FB pin
voltage is decreased by the feedback control. When the
FB pin voltage decreases to VFB(OFF) or less, the IC stops
switching operation and the VCC pin voltage decreases.
When the VCC pin voltage decreases to VCC(BIAS), the
Bias Assist function is activated and the startup failure is
prevented.
VCC pin
voltage
VCC(ON)
VCC(BIAS)
VCC(OFF)
IC starts operation
Startup success
Target operating
voltage
Increase with rising of
output voltage
Bias assist period
Startup failure
Time
Figure 10-3 VCC pin voltage during startup period
10.4 Soft Start Function
Figure 10-4 shows the behavior of VCC pin voltage
and drain current during the startup period.
The IC activates the soft start circuitry during the
startup period. Soft start time is fixed to around 6 ms.
during the soft start period, overcurrent threshold is
increased step-wisely (5 steps). This function reduces
the voltage and the current stress of a power MOSFET
and the secondary side rectifier diode.
Since the Leading Edge Blanking Function (refer to
Section 10.6) is deactivated during the soft start period,
there is the case that ON time is less than the Leading
Edge Blanking Time, tBW. After the soft start period,
D/ST pin current, ID, is limited by the Drain Current
Limit, IDLIM, until the output voltage increases to the
target operating voltage. This period is given as tLIM. In
case tLIM is longer than the OLP Delay Time, tOLP, the
output power is limited by the Overload Protection
(OLP) operation. Thus, it is necessary to adjust the value
of output capacitor and the turn ratio of auxiliary
winding D so that the tLIM is less than tOLP = 58 ms
(min.).
VCC pin Startup of IC Startup of SMPS
voltage
Normal opertion
tSTART
VCC(ON)
VCC(OFF)
Time
D/ST pin
current, ID
Soft start period
approximately 6 ms (fixed)
IDLIM
tLIM < tOLP (min.)
Time
Figure 10-4 VCC and ID behavior during startup
10.5 Constant Output Voltage Control
The IC achieves the constant voltage control of the
power supply output by using the current-mode control
method, which enhances the response speed and
provides the stable operation.
The FB/OLP pin voltage is internally added the slope
compensation at the feedback control (refer to Section
5.Block Diagram), and the target voltage, VSC, is
generated. The IC compares the voltage, VROCP, of a
current detection resistor with the target voltage, VSC, by
the internal FB comparator, and controls the peak value
of VROCP so that it gets close to VSC, as shown in Figure
10-5 and Figure 10-6.
● Light load conditions
When load conditions become lighter, the output
voltage, VOUT, increases. Thus, the feedback current
from the error amplifier on the secondary-side also
increases. The feedback current is sunk at the FB/OLP
pin, transferred through a photo-coupler, PC1, and the
FB/OLP pin voltage decreases. Thus, VSC decreases,
and the peak value of VROCP is controlled to be low,
and the peak drain current of ID decreases. This
control prevents the output voltage from increasing.
● Heavy load conditions
When load conditions become greater, the IC
performs the inverse operation to that described above.
Thus, VSC increases and the peak drain current of ID
increases.This control prevents the output voltage
from decreasing.
In the current mode control method, when the drain
current waveform becomes trapezoidal in continuous
operating mode, even if the peak current level set by the
STR4A100 - DSJ Rev.3.3
SANKEN ELECTRIC CO.,LTD.
Aug.06, 2015
http://www.sanken-ele.co.jp
© SANKEN ELECTRIC CO.,LTD. 2011
11
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet STR4A164HD.PDF ] | |
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